September 1944. The Allies have captured the port of Antwerp but the Germans still control the Scheldt estuary, preventing supplies reaching Antwerp and the Allied forces. Walcheren Island is key to the German's defence. Operation Market Garden is launched, hoping to penetrate directly into Germany via Arnhem in Holland. A glider from this operation is forced to crash land on Walcheren, leaving a handful of British troops trapped behind enemy lines. Meanwhile a Dutch teenager accidentally kills three Germans, causing a tragic chain of events. On the German staff is a Dutch soldier who now starts to question where his loyalties lie.